Dave Holloway searches for answers about his daughter's disappearance. The new series premieres August 19th at 9/8c.

The Disappearance of Natalee Holloway premieres Saturday, August 19 at 7/6c and 9/8c.

These celebrities were all reported missing. Some cases ended in tragedy. Others had happier endings.

SINÉAD O’CONNOR

Irish singer Sinéad O'Connor went for a bike ride in the suburbs of Chicago on May 15, 2016 at 6 a.m. and she didn't return home. She was then reported missing, and county police issued an alert for her. Just a few days before she vanished, the "Nothing Compares 2 U" singer had written an alarming Facebook post describing the pain of the custody battle she was in over her son. Friends and family grew increasingly worried as the singer struggled with depression and previously attempted suicide. Luckily, she was found safe after a little over 24 hours.

KURT COBAIN

Before the Nirvana frontman died on April 5, 1994, Cobain fled a rehab facility in California. For several days, his family tried to track him down. His mother filed a missing persons report, and his wife, Courtney Love, hired a P.I. He was apparently seen at a sporting goods store in Seattle purchasing shotgun cartridges while wearing a disguise: an overcoat and big sunglasses. Despite the attempt to conceal his identity, he was recognized by several people.

Cobain’s body was found at the house he shared with Love and their daughter on April 8, 1994 with a suicide note and a gun. His death has bred several conspiracy theories about how he died.

OZZY OSBOURNE

In May of 2016, Sharon Osbourne kicked Ozzy out of the house for an alleged infidelity: She reportedly discovered he had been cheating on her with stylist Michelle Pugh. First, the singer went to the Beverly Hills Hotel, but he soon after disappeared. His worried children were unable to find him. Luckily, he turned up a few days later.

MARGOT KIDDER

Margot Kidder was famous for playing Lois Lane in "Superman" in 1978. She went missing in April of 1996. She was found four days later in a stranger’s backyard -- delusional, disoriented and dirty. Her two front teeth were lost in the incident. Kidder called it "the most public freakout in history." The actress was bipolar and did not take medication at the time. During her “freakout,” she believed her first husband was trying to kill her, with the help of the CIA. She ended up sleeping on the streets before showing up in the stranger's backyard.

ANDREW KOENIG

Best known as "Boner" from "Growing Pains," Koenig went missing in 2010 while traveling to Vancouver, British Columbia. The actor suffered from depression, and not long before he vanished, he returned some items to a friend, a classic warning sign of suicidal tendencies. His body was found 11 days later in a park. He had hanged himself in a wooded area.

JASON MEWES

In 2001, "Jay and Silent Bob" actor Jason Mewes failed to appear at a mandatory court hearing regarding heroin charges he was facing. A warrant was issued for his arrest, but he wasn’t seen again for about two years. He re-emerged in 2003 and turned himself in. He had woken up on Christmas morning to find the couch he had passed out on after using heroin on fire. It was at this point he decided he had hit rock bottom. He was then court-ordered to go to rehab for six months.